It's not area rich in campsites, as obviously land prices are at a premium, and the land is also extremely steep! Using Google maps there seem to be just two sites within a reasonable distance -
Camping de la Laune (which I can't say looks up to much) and Camping Municipal St Michel at Menton - but the last one states that the access route is not suitable for towed caravans in the Caravan Europe book! The access road to de la Laune also looks a bit tricky on a map.
Personally I would find a more accessible site further west - and then use the excellent rail system (and cheap tourist tickets) to get into and out of Monaco/Monte Carlo.
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